/*
 * Copyright 2024 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.pajamas.daydream.template.sequence.context;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import org.pajamas.daydream.template.sequence.SequenceContext;

import java.lang.reflect.Field;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * @author william
 * @since 2024/4/5
 */
public class PojoContext implements SequenceContext {

    private final Object pojo;

    public PojoContext(Object pojo) {
        this.pojo = pojo;
    }

    private static Object getFieldValue(Object target, String fieldName) throws NoSuchFieldException,
            IllegalAccessException {
        if (target == null || StringUtils.isBlank(fieldName)) {
            return null;
        }
        Field[] fields = target.getClass().getDeclaredFields();
        if (ArrayUtils.isEmpty(fields)) {
            return null;
        }

        for (Field field : fields) {
            if (field != null) {
                if (StringUtils.equals(field.getName(), fieldName)) {
                    field.setAccessible(true);
                    return field.get(target);
                }
            }
        }
        return null;
    }

    @Nullable
    @Override
    public Object doGetValue(@Nonnull String key) {
        if (this.pojo != null) {
            try {
                return getFieldValue(this.pojo, key);
            } catch (NoSuchFieldException | IllegalAccessException ex) {
                throw new RuntimeException(ex);
            }
        }
        return null;
    }
}
